Use api_day_flag to detect night-to-day nodes
Use api_day_flag to detect night-to-day nodes

This should prevent battle prediction from breaking if Node.engage() is
called from a context where api_name is not set.

Yukinyaa/KC3Kai,kololz/KC3Kai,Adrymne/KC3Kai,sinsinpub/KC3Kai,Adrymne/KC3Kai,KC3Kai/KC3Kai,KC3Kai/KC3Kai,DynamicSTOP/KC3Kai,sinsinpub/KC3Kai,Adrymne/KC3Kai,dragonjet/KC3Kai,dragonjet/KC3Kai,DynamicSTOP/KC3Kai,reinforce/KC3Kai,reinforce/KC3Kai,reinforce/KC3Kai,KC3Kai/KC3Kai,Yukinyaa/KC3Kai,DynamicSTOP/KC3Kai,kololz/KC3Kai,sinsinpub/KC3Kai,kololz/KC3Kai